Abstract
Light emitting diode (LED) has more advantages compared with a traditional incandescent light bulb and a fluorescent lamp, such as small size, low quantity of heat, long life, low power consumption, fast response, plain packaging and ease of develop ment of a frivolous short product. A methodology is proposed to improve the uniformity of the LED illumination system. As a light source in a backlight unit (BLU), the requirement for optical characteristics of a LED is different from highly directional conventional ones. New diffused-type LEDs need to be developed to fulfill the requirement of the BLU industry. A non-spherical lens is designed to optimize uniformity, and a great improvement in uniformity from 28.4 to 64% is demonstrated. In the future, it may used in an LED display to improve the unevenness of illumination.
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References
W. A. Parkyn and D. G. Pelka: Proc. SPIE 4446 (2002) 232.
S. J. Lee: Proc. SPIE 4278 (2001) 99.
B. A. Jacobson and R. D. Gengelbach: Proc. SPIE 4446 (2002) 121.
P. C.-P. Chao, L.-D. Liao, and C.-W. Chiu: Proc. SPIE 6196 (2006) 61960N.
J.-G. Chang, L.-D. Liao, and C.-C. Hwang: Proc SPIE 6289 (2006) 62890X.
Kenly Precision Industrial Co., Ltd., and the type of base is KHP01-2A.
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Chang, YC., Ou, CJ., Tsai, YS. et al. Nonspherical LED packaging lens for uniformity improvement. OPT REV 16, 323–325 (2009). https://doi.org/10.1007/s10043-009-0059-7
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DOI: https://doi.org/10.1007/s10043-009-0059-7